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InventorsHistory
of CalculatorsSlide RulerHistory
of the Slide RulerBefore we had calculators we had
slide rules.In 1632, the circular and rectangular
sliderule was invented by W. Oughtred (1574-1660).

Illustration:
Adding Machine

CalculatorsWilliam
Seward Burroughs Born 1857 Rochester, N.Y - Died 1898In 1885, Burroughs filed his first
patent for a calculating machine. However, his 1892 patent was for an improved
calculating machine with an added printer. William Seward Burroughs invented
the first practical adding and listing machine - National Inventors Hall
of Fame.

Burroughs
Adding Machine CompanyBurroughs Adding Machine Company
traced its founding to William Seward Burroughs who invented and patented
the first workable adding and listing machine in St. Louis, Missouri in
1885.